diff --git a/services/web/test/acceptance/src/mocks/MockGitBridgeApi.mjs b/services/web/test/acceptance/src/mocks/MockGitBridgeApi.mjs
index 4927814b9a..805bbdd8fe 100644
--- a/services/web/test/acceptance/src/mocks/MockGitBridgeApi.mjs
+++ b/services/web/test/acceptance/src/mocks/MockGitBridgeApi.mjs
@@ -3,12 +3,16 @@ import AbstractMockApi from './AbstractMockApi.mjs'
 class MockGitBridgeApi extends AbstractMockApi {
   reset() {
     this.projects = {}
+    this.postbacks = {}
   }
 
   applyRoutes() {
     this.app.delete('/api/projects/:projectId', (req, res) => {
       this.deleteProject(req, res)
     })
+    this.app.post('/postback/:id', (req, res) => {
+      this.postback(req, res)
+    })
   }
 
   deleteProject(req, res) {
@@ -16,6 +20,24 @@ class MockGitBridgeApi extends AbstractMockApi {
     delete this.projects[projectId]
     res.sendStatus(204)
   }
+
+  // Git bridge accepts a postback to indicate when a operation is complete.
+  // Each postback is identified by a unique ID.
+  // Allow registering a handler which resolves when a postback is received.
+  registerPostback(id) {
+    return new Promise((resolve, reject) => {
+      this.postbacks[id] = { resolve, reject }
+    })
+  }
+
+  postback(req, res) {
+    const { id } = req.params
+    const postbackData = req.body
+    if (this.postbacks[id]) {
+      this.postbacks[id].resolve(postbackData)
+    }
+    res.sendStatus(204)
+  }
 }
 
 export default MockGitBridgeApi